Here is the full list of all 22 Pixel Puzzle Makeout League achievements.
Unlocked all special themes
Completed the Puzzle Maze
Remade the world / Set off on your own
Remembered what part she is
Found true love
Solved 200 pixel puzzles
Became whole with Piecea
Became partners with Chess
Found the truth with Crossword
Saved Sudoku
Made a costly mistake
Solved 100 pixel puzzles
Explored the digital realm
Survived an encounter with the Villain
Went on a sneaking mission with Chess
Climbed a mountain with Piecea
Tried something new with Sudoku
Learned about Crossword's past
Got to know a member of the Puzzle League
Escaped the Villain's clutches
Let the timer run out
Couldn't resist